Y axis lost error when saving a file

[tmig]

I was saving a file with multiple y axes and I cancelled out of the save, but when I pressed cancel and the dialog closed only one axis remained plotted. I couldn't get back the other. Fortunately I had saved it in a previous version, and was able to retrieve the older version and do the modifications to get back to where I was..
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Mercedes-Benz Sprinter

[DPlotAdmin]

Sorry, I don't have a good answer for this one. I tried several variations but couldn't duplicate anything like this (but I didn't expect to as I can't think of any possible explanation for that happening). The only thing I can think of is inadvertently hiding the 2nd curve... but that seems very unlikely.